Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[mirror_ubuntu-zesty-kernel.git] / fs / overlayfs / readdir.c

diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index 9e79f6458dfbfc564eab296d0d96d15ee491506a..cf37fc76fc9fc02f00caf5a64bd632f20942a528 100644 (file)
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -36,6 +36,7 @@ struct ovl_dir_cache {
 
 struct ovl_readdir_data {
        struct dir_context ctx;
+       struct dentry *dentry;
        bool is_lowest;
        struct rb_root root;
        struct list_head *list;
@@ -206,17 +207,8 @@ static int ovl_check_whiteouts(struct dentry *dir, struct ovl_readdir_data *rdd)
        struct ovl_cache_entry *p;
        struct dentry *dentry;
        const struct cred *old_cred;
-       struct cred *override_cred;
-
-       override_cred = prepare_creds();
-       if (!override_cred)
-               return -ENOMEM;
 
-       /*
-        * CAP_DAC_OVERRIDE for lookup
-        */
-       cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
-       old_cred = override_creds(override_cred);
+       old_cred = ovl_override_creds(rdd->dentry->d_sb);
 
        err = down_write_killable(&dir->d_inode->i_rwsem);
        if (!err) {
@@ -232,7 +224,6 @@ static int ovl_check_whiteouts(struct dentry *dir, struct ovl_readdir_data *rdd)
                inode_unlock(dir->d_inode);
        }
        revert_creds(old_cred);
-       put_cred(override_cred);
 
        return err;
 }
@@ -288,6 +279,7 @@ static int ovl_dir_read_merged(struct dentry *dentry, struct list_head *list)
        struct path realpath;
        struct ovl_readdir_data rdd = {
                .ctx.actor = ovl_fill_merge,
+               .dentry = dentry,
                .list = list,
                .root = RB_ROOT,
                .is_lowest = false,